JP6181436B2 - Method for curing cast concrete and concrete structure - Google Patents

Description

  For example, the present invention relates to a method for curing cast concrete and a concrete structure in which temperature stress based on internal temperature becomes a problem in concrete cast in a massive shape such as mass concrete.

  Conventionally, there has been a problem that temperature cracking occurs when a concrete structure is constructed. In particular, a large block concrete structure called a mass concrete for constructing a large-scale structure such as a bridge pier or a dam is liable to generate a temperature crack due to a temperature stress at the time of curing.

  Explaining in detail, the temperature stress that causes the occurrence of temperature cracks is internal stress and external stress, which will be described later, and is generated in the member because the hydration heat of cement and the volume change of concrete due to self-shrinkage are restrained. Compressive stress or tensile stress. Specifically, internal stress increases the internal temperature due to the heat of hydration that occurs during the setting of concrete structures, especially in the case of massive concrete structures. A difference (temperature gradient) occurs between the internal temperature and the surface temperature, and this occurs due to the volume change (expansion / contraction) of the concrete due to this temperature difference. And when this internal stress exceeds the tensile strength of concrete, a crack will arise.

When the concrete structure is externally constrained and the concrete hardened in the state of thermal expansion due to heat of hydration is cooled and contracted, this external stress is generated at the external constrained location. If the value exceeds the tensile strength of concrete, cracks occur.
As described above, a crack generated when at least one of an internal stress and an external stress resulting from a volume change due to heat of hydration occurs is referred to as a temperature crack. In this specification, the temperature stress is both internal stress and external stress or one of the stresses, and the temperature crack caused by the temperature stress is caused by both internal stress and external stress or one of the stresses. It refers to the cracks that occur.

  In order to prevent such temperature cracks, it is necessary to suppress the temperature rise inside the concrete. For example, as disclosed in Patent Document 1, a pipe for conducting a cooling medium is provided inside the concrete. A method of suppressing the temperature rise in the concrete due to heat of hydration by passing a cooling medium, that is, a pipe cooling method is used.

  However, in the case of such a pipe cooling method, the cooling medium that conducts the pipe that is piped inside the concrete exchanges heat with the concrete, and in order to suppress the temperature rise inside the concrete, the pipe is conducted and heat exchange is performed. Therefore, it is necessary to provide a facility for cooling and circulating the cooling medium whose temperature has increased due to the above, and the facility scale becomes large, which may increase the construction space and cost. Further, since the cooling medium circulates, the pipes piped inside the concrete cannot be taken out and cannot be reused as so-called burying, which contributes to an increase in cost.

JP 2004-360333 A

  Then, this invention aims at providing the curing method and concrete structure of the placement concrete which can suppress the temperature rise inside concrete with a simple structure.

In the present invention, a cylindrical guide tube is installed before placing, and a void communicating between the inside and outside of the placed concrete is placed upward with respect to the inside of the placed concrete. And a member main body in which one end side in the axial direction is set at a high temperature portion and the other end side is set at a low temperature portion, a heat transfer medium that is enclosed in the member main body and absorbs and evaporates, and a member main body A vaporization medium conducting path that is disposed inside and that vaporizes the heat transfer medium that has absorbed and vaporized at the high temperature section, and is conducted to the low temperature section via the vaporization medium conduction path, and the low temperature section The heat transfer medium that is cooled and liquefied by a part is composed of a liquefied medium conduction path that conducts to the high temperature part, and a heat conduction member that conducts heat from the high temperature part toward the low temperature part, the ball so that the outer side of the pouring concrete Placed in de, and the voids formed larger in diameter than the heat conductive member, between the thermally conductive member disposed in the void, while injecting a thermally conductive fluid having thermal conductivity, hydration Heat is conducted by the heat conducting member from the inside of the concrete heated to the outside to cure the cast concrete, and after the cast concrete is cured, the heat conducting member and the guide tube are removed. By filling the void with a filler having a specific gravity greater than that of the thermally conductive fluid composed of a liquid, even if the thermally conductive fluid remains inside the void, the specific gravity is higher than that of the filler. This is a method for curing cast concrete in which a thermally conductive fluid, which is a small liquid, floats without being mixed with the filler and closes the void .

  The above-mentioned cast concrete is composed of fresh concrete that constitutes appropriate concrete such as general structural concrete, cold concrete, summer concrete, mass concrete, fluidized concrete, high fluidized concrete, or grout such as mortar or cement milk. Is.

  To provide a void that communicates the inside and the outside of the cast concrete so that the outside side is upward with respect to the inside side of the cast concrete that has been placed as described above, from the inside of the cast concrete toward the outside, It means a void formed vertically upward or diagonally upward.

  The heat conducting member may be a member that conducts heat from the high temperature portion toward the low temperature portion, such as a highly efficient heat conducting member called a heat pipe, or a bar-like or plate-like copper member having high heat conductivity.

The thermal conductive fluid may be a member having thermal conductivity and fluidity such as a liquid such as water, a gel body, and a metal powder.
  The filler for filling the void can be a so-called fresh concrete, a grout such as mortar or cement milk, and a filler such as resin mortar.

According to the present invention, the temperature rise inside the concrete can be suppressed with a simple structure.
Specifically, in order to provide a void that communicates the inside and outside of the cast concrete so that the exterior side faces upward with respect to the inside of the cast concrete that has been cast, And can be easily reached from the outside through the void.

  In addition, in the void, a heat conductive member that conducts heat from the high temperature portion toward the low temperature portion is disposed so that the low temperature portion is on the outside of the cast concrete. From the outside, heat can be conducted by the heat conducting member.

  In addition, the heat conduction member is arranged in the void provided in the placed concrete, and the heat inside the concrete is conducted to the outside. Therefore, the heat conduction member can be removed from the void after curing of the cast concrete is completed. In other words, the heat conduction member can be reused, and an increase in cost can be suppressed.

Further, the heat conducting member is sealed in the member main body having one end side in the axial direction set as the high temperature portion and the other end side set in the low temperature portion, and absorbs heat to evaporate. A heat transfer medium, a vaporization medium conduction path that is disposed inside the member body and that absorbs heat in the high temperature portion and vaporizes the heat transfer medium to the low temperature section, and the low temperature via the vaporization medium conduction path. High efficiency heat conduction can be easily performed by configuring the heat transfer medium that is conducted to the section and cooled and liquefied at the low temperature section with the liquefied medium conduction path that conducts to the high temperature section.

  Specifically, since the heat conducting member is constituted by the member main body, the heat transfer medium, the vaporization medium conducting path, and the liquefied medium conducting path, the efficiency is improved by using a durable heat conducting member with little deterioration in conductivity. Heat conduction.

In addition, a thermal conductive fluid having thermal conductivity is injected between the void formed to have a larger diameter than the thermal conductive member and the thermal conductive member disposed in the void, and the high temperature is generated by heat of hydration. From the inside of the converted concrete to the outside, by conducting heat with the heat conducting member and curing the cast concrete, the heat conducting member can be easily arranged with respect to the void, and the void and the heat conducting member It is possible to efficiently conduct the heat inside the concrete to the outside by suppressing a decrease in thermal conductivity due to the gap generated between the two.

Specifically, by forming the void with a diameter larger than that of the heat conducting member, for example, even a long heat conducting member, the heat conducting member can be easily arranged inside the void.

Further, by forming the void with a diameter larger than that of the heat conducting member, a gap is formed between the heat conducting member disposed inside the void and the void, and an air layer having a low thermal conductivity is formed in the gap. The heat of the concrete outside the void is prevented from being transferred to the heat conducting member by the air layer, but by injecting a heat conducting fluid between the heat conducting member and the void, The gap formed between the conductive member and the void can be filled with the heat conductive fluid without any gap. Therefore, the heat of the concrete outside the void can be transferred to the heat conductive member via the heat conductive fluid, and the heat inside the concrete can be efficiently conducted to the outside.

In addition, by filling the void with a filler having a specific gravity greater than that of the thermally conductive fluid made of liquid, even if the thermally conductive fluid remains inside the void, Since the heat conductive fluid, which is a liquid with a small specific gravity, floats without being mixed with the filler and closes the void, the heat conductive fluid does not remain in the void and the void is reliably filled with the filler. Can be filled.

As an aspect of the present invention, a plurality of the voids can be arranged in a planar direction with respect to the cast concrete.
Arranging a plurality of elements in the above-described plane direction means an arrangement in which the intervals between the voids are substantially equal, such as a one-character arrangement, a cross-character arrangement, a planar regular triangle arrangement, a lattice arrangement, or a staggered arrangement, or based on a predetermined regularity. Arrangements with different intervals can be used, and random arrangements can be made.

  As a result, it is possible to reduce the range of heat conduction from the inside of the concrete heated to the outside by the heat conducting member arranged in one void, that is, the range of the inside of the concrete borne by the heat conducting member arranged in the void. It is made compact. Therefore, the heat transfer distance for heat transfer inside the concrete is shortened, and heat can be efficiently conducted from the inside of the concrete to the outside via the heat conducting member.

As an aspect of the present invention, the interval between the plurality of voids arranged in the plane direction can be set wider outside in the plane direction than the center side in the plane direction of the placed concrete.
According to this invention, the heat conduction member is densely arranged on the center side in plan view where the heat of hydration is high, and the heat conduction member is sparsely arranged on the outside in plan view where the heat of hydration is low. The conductive member can efficiently conduct heat from the inside of the concrete to the outside.

Further, as an aspect of the present invention, the void can be configured by installing a cylindrical guide tube installed before placing, and the guide tube can be removed after the placing concrete is hardened.
According to the present invention, the guide tube functioning as a void can be removed in addition to the heat conducting member after completion of the cast concrete, so that a more solid concrete structure can be constructed by filling the void with a filler. it can.

  Further, as an aspect of the present invention, a low temperature promotion step for promoting low temperature can be performed on the low temperature portion. Alternatively, the heat conducting member can be provided with a low temperature promoting portion that promotes low temperature with respect to the low temperature portion.

Promoting lowering the temperature of the above-mentioned low-temperature part means that air is blown toward the low-temperature part and the generation of heat of vaporization in the low-frequency part is promoted to promote low-temperature, and the low-temperature part is, for example, a cooling pack. The lowering of the low temperature part is promoted by an appropriate method such as cooling to promote lowering of the temperature. The low temperature part may be provided with, for example, a heat sink for promoting the low temperature as the low temperature promotion part.
According to the present invention, heat conduction from the high temperature portion to the low temperature in the heat conducting member is promoted, and heat can be more efficiently conducted from the inside of the concrete to the outside.

  In addition, the concrete structure configured by curing by the curing method using the heat conducting member in this way can conduct the heat inside the concrete heated to the outside through the heat conducting member in the curing state, An increase in temperature inside the concrete can be suppressed. Therefore, generation of temperature stress accompanying the rise in temperature inside the concrete is suppressed, generation of temperature cracks due to the generated temperature stress is suppressed, and a dense concrete structure can be constructed.

  According to the present invention, it is possible to provide a method for curing cast concrete and a concrete structure capable of suppressing the temperature rise inside the concrete with a simple structure.

The schematic perspective view of the concrete structure cured and constructed by the heat pipe curing method. The AA sectional view of the concrete structure built by curing with the heat pipe curing method. The schematic sectional drawing of a heat pipe. The schematic sectional drawing of the heat pipe of a heat transfer state. The flowchart of the heat pipe curing method. Explanatory drawing by the front view of the heat pipe curing method. Explanatory drawing by the front view of the heat pipe curing method. Explanatory drawing by the front view of the heat pipe curing method. Explanatory drawing by the front view of the heat pipe curing method. Explanatory drawing by the front view of another heat pipe curing method. The front view of another heat pipe curing method. Cross-sectional explanatory drawing of the test body used for the effect confirmation test of the heat pipe curing method. The test result graph of the effect confirmation test of the heat pipe curing method. Simulation results of heat pipe curing method. Simulation results of heat pipe curing method. Explanatory drawing of the concrete structure cured and constructed | assembled with the heat pipe curing method of another arrangement | positioning.

An embodiment of the present invention will be described below with reference to the drawings.
FIG. 1 shows a schematic perspective view of a concrete structure 100 constructed by curing with a heat pipe curing method, and FIG. 2 shows an AA sectional view of the concrete structure 100 constructed by curing with a heat pipe curing method. 3 shows a schematic cross-sectional view of the heat pipe 10, and FIG. 4 shows a schematic cross-sectional view of the heat pipe 10 in a heat transfer state.

  A concrete structure 100 obtained by curing the cast concrete 30 (see FIG. 6) shown in FIG. 1 by a heat pipe curing method is, for example, a structure imitating a bridge pier, and a vertical main body 101, The footing portion 102 is configured in a substantially L shape in a side view. The concrete structure 100 is an example of a concrete structure cured by a heat pipe curing method, and is not limited to a concrete structure having such a structure. For example, the concrete structure 100 is a large block called mass concrete. It may be a concrete structure.

  Further, as shown in FIG. 2, the concrete structure 100 is filled with non-shrinking mortar with a plurality of voids B arranged at equal intervals so as to have a lattice shape in a plan view in the main body 101 of the concrete structure 100. It is filled with mortar 103. Instead of the filling mortar 103, the void B may be filled with the same concrete as the concrete structure 100.

  In constructing such a concrete structure 100, the heat pipe 10 used for curing is, as shown in FIG. 3, a hollow pipe body 11 composed of a corrugated pipe having a corrugated cross section on one side, and a pipe body 11 The end cap 12 is sealed at both ends, the working fluid 13 is sealed inside the pipe body 11 sealed by the end cap 12, and the wick 14 is disposed inside the pipe body 11.

  The pipe body 11 is formed of a metal pipe having excellent thermal conductivity and durability, and includes a wick 14 that forms a conduction path for the liquid working fluid 13 inside. The vaporized working fluid 13 is provided inside the wick 14. A vaporized hydraulic fluid conduction space N serving as a conduction path is formed.

The end cap 12 is fitted to the end of the pipe body 11 so that the pipe body 11 is in a sealed state so that the hydraulic fluid 13 enclosed in the pipe body 11 does not leak.
The hydraulic fluid 13 is composed of a volatile liquid such as alternative chlorofluorocarbon, alcohol, or water.

  The predetermined range of the upper part of the heat pipe 10 thus configured is a low temperature part 10a, the predetermined range of the lower part is a high temperature part 10c, and the heat insulating part is insulated from the outside between the low temperature part 10a and the high temperature part 10c. 10b. In the heat pipe 10, the hydraulic fluid 13 that has absorbed the heat input from the high temperature portion 10c is vaporized, and the vaporized hydraulic fluid 13 passes through the vaporized hydraulic fluid conduction space N corresponding to the heat insulating portion 10b to form a gaseous state. The hydraulic fluid 13 reaches the low temperature part 10a. The hydraulic fluid 13 that has reached the low temperature portion 10 a liquefies by radiating heat at the low temperature portion 10 a, and moves to the high temperature portion 10 c through the wick 14.

  Thus, in the heat pipe 10, the working fluid 13 that has absorbed heat and vaporized in the high temperature portion 10c reaches the low temperature portion 10a, and heat is dissipated and liquefied in the low temperature portion 10a. Heat can be efficiently transferred to the low temperature part 10a.

  Note that the above description of the heat pipe 10 is an example of the structure of the heat pipe, and the structure of the heat pipe that functions as a heat conducting member is not limited to the above structure. On the other hand, a suitable kind of hydraulic fluid, the shape of the pipe body, a wick structure, or a heat pipe in which the end of the pipe body is crimped without using an end cap may be used.

  In the heat pipe curing method using the heat pipe 10, the heat pipe 10 is arranged in the void B formed by the sheath 20 provided in the concrete structure 100, and the gap formed between the sheath 20 and the heat pipe 10 is disposed. Pore water 21 is poured.

At this time, it arrange | positions so that the low temperature part 10a of the heat pipe 10 may be exposed from the void B. FIG.
As the interstitial water 21, water having a specific gravity smaller than that of the filling mortar 103 is used.

  Further, the sheath 20 forming the void B is formed in a cylindrical shape by winding a belt-like member in a spiral shape, and a plurality of sheaths 20 are arranged at equal intervals so as to have a lattice shape in a plan view, for example.

  As described above, in the heat pipe curing method in which the heat pipe 10 is disposed in the void B, the hydration heat H1 of the concrete structure 100 is passed through the sheath 20 and the pore water 21 injected into the void B. 10 is transmitted to the hydraulic fluid 13 from the high temperature portion 10c.

  The hydraulic fluid 13 vaporized by the transmitted heat rises in the vaporized hydraulic fluid conduction space N, and after reaching the low temperature portion 10a, the heat is dissipated as the divergent heat H2, and the hydraulic fluid is liquefied by being cooled by the divergent heat H2. 13 returns to the low temperature part 10a through the wick 14. This is repeated, and the heat of hydration H1 inside the concrete structure 100 is dissipated as the divergent heat H2 outside the void B through the heat pipe 10. That is, the heat of hydration H1 inside the concrete structure 100 can be efficiently conducted to the outside of the void B by the heat pipe 10.

The construction procedure of the heat pipe curing method for transmitting the hydration heat H1 of the concrete structure 100 to the outside by such a mechanism will be described in detail with reference to FIGS.
5 shows a flowchart of the heat pipe curing method, FIG. 6 (a) shows a front view of the installed state of the sheath 20 in the heat pipe curing method, and FIG. 6 (b) shows the cast state of the cast concrete 30. FIG. 7A shows a front view of the heat pipe 10 installed in the void B, and FIG. 7B shows a front view of the water injection state of the pore water 21.

  FIG. 8A shows a front view of the heat pipe 10 removed, FIG. 8B shows a front view of removing the sheath 20 after removing the pore water 21, and FIG. FIG. 9B shows a front view of a state where the void B is closed with the filling mortar 103. FIG.

  In the heat pipe curing method using the heat pipe 10, first, as shown in FIG. 6 (a), in order to form the void B, the sheath 20 is installed at a predetermined position (step s1), and FIG. As shown in FIG. 5, the placing concrete 30 is placed (step s2).

  Then, the heat pipe 10 is set in the void B formed by the sheath 20 (see step s3, FIG. 7A), and in the void B, the gap formed between the inner surface of the sheath 20 and the heat pipe 10 is set. The pore water 21 is poured (see step s4, FIG. 7B). In this state, the cast concrete 30 is cured and cured until a predetermined strength appears (step s5). After the curing is completed (step s6), as shown in FIG. Is removed (step s7), and the pore water 21 is removed (step s8).

Further, the sheath 20 formed by spirally winding the band-shaped material is removed by unwinding the band-shaped material upward (see step s9, FIG. 8B), and FIG. As shown in (a), the void B is exposed to the hardened cast concrete 30. Then, as shown in FIG. 9B, the void B is filled with the filling mortar 103 and closed (step s10), and the heat pipe curing method is completed.
During the curing in step s5, the low temperature part 10a exposed from the void B may be blown with a blower or the like to promote the divergence of the dissipated heat H2 from the low temperature part 10a.

  Thus, in the heat pipe curing method using the heat pipe 10, the void B that communicates the inside and the outside of the cast concrete 30 so that the outside is directed upward with respect to the inside of the cast concrete 30 that has been cast. Since the heat pipe 10 that conducts heat from the high temperature part 10c to the low temperature part 10a is arranged in the void B so that the low temperature part 10a is on the outside of the cast concrete 30, the inside of the concrete has a simple structure. Temperature rise can be suppressed.

  Specifically, in order to provide the void B that communicates the inside and the outside of the cast concrete 30 so that the outer side faces upward with respect to the inside of the cast concrete 30 that has been cast, the temperature is increased by the hydration heat H1. The inside of the concrete can be easily reached from the outside via the void B.

  In addition, the heat pipe 10 that conducts heat from the high temperature portion 10c to the low temperature portion 10a is disposed in the void B so that the low temperature portion 10a is on the outside of the cast concrete 30, so that the temperature is increased by the hydration heat H1. Heat can be conducted by the heat pipe 10 from the inside of the concrete to the outside.

  In addition, the heat pipe 10 is arranged in the void B provided in the placed concrete 30 to conduct the heat inside the concrete to the outside. It can be removed, that is, the heat pipe 10 can be reused.

  Further, the heat pipe 10 is enclosed in a pipe body 11 having one end side in the axial direction set as the high temperature portion 10c and the other end side set in the low temperature portion 10a, and the pipe body 11 absorbs heat and evaporates. The working fluid 13 is disposed inside the pipe body 11, and the vaporized working fluid conduction space N that conducts the working fluid 13 that is vaporized by absorbing heat at the high temperature portion 10 c to the low temperature portion 10 a, and the vaporized working fluid conduction space N. Since the hydraulic fluid 13 that is conducted to the low temperature portion 10a and cooled and liquefied by the low temperature portion 10a is composed of the wick 14 that conducts to the high temperature portion 10c, highly efficient heat conduction can be easily performed.

  Specifically, the heat pipe 10 is composed of the pipe body 11, the hydraulic fluid 13, the vaporized hydraulic fluid conduction space N, and the wick 14, so that heat can be efficiently heated using the durable heat pipe 10 with less conductivity deterioration. Can conduct.

  In addition, the void B is formed to have a larger diameter than the heat pipe 10 and the pore water 21 having thermal conductivity is injected between the heat pipe 10 and the void B arranged in the void B. The heat pipe 10 can be easily arranged, and a decrease in thermal conductivity due to a gap generated between the void B and the heat pipe 10 can be suppressed, so that heat inside the concrete can be efficiently conducted to the outside.

Specifically, by forming the void B larger in diameter than the heat pipe 10, the long heat pipe 10 can be easily inserted and disposed in the void B.
Further, by forming the void B larger in diameter than the heat pipe 10, an air layer having a low thermal conductivity is formed in the gap formed between the heat pipe 10 and the void B disposed inside the void B. Thus, although the heat of the concrete outside the void B is prevented from being transferred to the heat pipe 10 by the air layer, the pore water is injected between the heat pipe 10 and the void B with the pore water 21. The heat of the cast concrete 30 outside the void B can be transferred to the heat pipe 10 via the heat sink 21, and the heat inside the concrete can be efficiently conducted to the outside.

  Further, since the pore water 21 having a specific gravity smaller than that of the filling mortar 103 is used, even if the pore water 21 remains in the void B after the heat pipe 10 is taken out after the curing is completed, the filling mortar 103 is filled in the void B. In this case, the interstitial water 21 which is a liquid having a specific gravity smaller than that of the filling mortar 103 floats without being mixed with the filling mortar 103, and the filling mortar surely fills the void B without leaving the interstitial water 21 in the void B. 103.

  In addition, the void B is configured by installing the cylindrical sheath 20 installed before placing, and the sheath 20 is removed after the placement concrete 30 is hardened. Since the sheath 20 that forms the void B can be removed in addition to the pipe 10, a solid concrete can be constructed by filling the void B with the filling mortar 103.

  In addition, since a plurality of voids B are arranged at substantially equal intervals in the plane direction with respect to the placement concrete 30, the range of conducting heat from the inside of the concrete heated to the void B in one place can be reduced in scale. That is, the range inside the concrete burdened by the heat pipe 10 arranged in the void B is made compact. Therefore, the heat transfer distance for heat transfer inside the concrete is shortened, and heat can be efficiently conducted from the inside of the concrete to the outside via the heat pipe 10.

  Further, when air is blown to the low temperature part 10a in order to promote a low temperature for the low temperature part 10a, heat conduction from the high temperature part 10c to the low temperature in the heat pipe 10 is promoted, and more efficiently, from the inside of the concrete to the outside. Can conduct heat.

  In addition, the concrete structure 100 configured by curing by the curing method using the heat pipe 10 in this way is the hydration heat H1 inside the concrete that has been heated through the heat pipe 10 in the curing state as the divergence heat H2. It can conduct to the outside, suppress the rise of the temperature inside the concrete, and the generation of temperature stress is suppressed. Therefore, it is possible to suppress the occurrence of temperature cracks due to the generated temperature stress and to build a dense concrete structure 100.

  The effect confirmation test and simulation conducted for confirming the effects as described above in the heat pipe curing method will be described with reference to FIGS.

  12 shows a cross-sectional explanatory view of the test body X used in the effect confirmation test of the heat pipe curing method, FIG. 13 shows a test result graph of the effect confirmation test of the heat pipe curing method, and FIGS. 14 and 15. Shows the simulation results of the heat pipe curing method.

  This effect confirmation test is a test for confirming the effect of suppressing the temperature rise of the placing concrete 30 by using the heat pipe 10 for the heat pipe curing method, and as shown in FIG. The installed concrete 30 is surrounded by a heat insulating material 50 and the heat pipe 10 is set on the sheath 20 provided on the placed placed concrete 30. Then, interstitial water 21 was poured into the gap formed between the sheath 20 and the heat pipe 10 to obtain the test specimen X. Moreover, concrete was simply placed in the same dimensions to obtain a test specimen for comparison (not shown).

  Further, as shown in FIG. 12, the test specimen X and the test specimen to be compared have a predetermined interval along the inside of the placed concrete 30, along the sheath 20, and further on the outer surface of the heat pipe 10. Then, a thermometer 60 was placed at an appropriate place, and the temperature change was observed.

  As a result, as shown in FIG. 13 (a), although the outside air temperature does not change greatly, the hydration heat H1 greatly increases during the first half of the curing period, that is, when the material age is young, and the hydration heat H1 increases with the material age. However, it was confirmed that the use of the heat pipe 10 resulted in a decrease in the temperature inside the concrete as compared with a countermeasure-free curing method that does not use the heat pipe 10. Moreover, it has confirmed that the temperature reduction effect by the heat pipe 10 with respect to an uncured curing method became large after age passed and the temperature inside concrete fell.

  Based on the results of the effect confirmation test shown in FIG. 13A, parameters in the simulation were set and a temperature analysis was performed. That is, the inverse analysis based on the result of the above-described effect confirmation test was performed, and parameters for performing a simulation according to the result of the effect confirmation test were determined as shown in FIG.

  And as shown in FIG. 14 and FIG. 15 which are the simulation results by the reverse analysis according to the effect confirmation test results, the heat pipe curing using the heat pipe 10 is compared with the case of curing the cast concrete 30 without countermeasures. In the method, a result having a temperature reduction effect was obtained. Moreover, as a result of aiming at the low-temperature part 10a of the heat pipe 10 exposed from the void B with a fan, and improving the thermal conductivity by the heat of vaporization in the low-temperature part 10a, sufficient heat compared with the case where it does not blow. It was confirmed that a reduction effect was obtained.

  Furthermore, it was confirmed that the temperature reduction effect was further increased by increasing the number of heat pipes 10 arranged per unit area. In addition, it has confirmed that the temperature reduction effect comparable as the pipe cooling method currently performed can be acquired by arrange | positioning about four heat pipes 10 per square meter.

  Thus, although the heat pipe curing method using the heat pipe 10 has a sufficient temperature reduction effect inside the cast concrete 30, as shown in FIG. 10A, the heat pipe curing method is applied to the low temperature portion 10 a of the heat pipe 10. In addition to blowing air, a heat radiating fin 15 for expanding the surface area may be provided in the low temperature portion 10a of the heat pipe 10 (see FIG. 10B). Furthermore, it may blow to the radiation fin 15 provided in the low temperature part 10a, and may aim at the further temperature reduction effect using the vaporization heat in the surface of the radiation fin 15. FIG.

  Further, the sheath 20 is formed by spirally winding a belt-shaped material, and after the cast concrete 30 is cured, the sheath 20 is removed by unwinding after removing the heat pipe 10 and the interstitial water 21. However, the sheath 20 may be removed before the heat pipe 10 and the pore water 21 are removed.

  Furthermore, as shown in FIG. 11, a sheath 20 having a corrugated cross section may be used like the pipe body 11 of the heat pipe 10. Thereby, the contact area of the placement concrete 30 and the sheath 20 may increase, and the heat transfer property of the hydration heat H1 of the placement concrete 30 may be improved.

In the correspondence between the configuration of the present invention and the above-described embodiment, the heat conduction member corresponds to the heat pipe 10,
Similarly,
The concrete curing method corresponds to the heat pipe curing method,
The member body corresponds to the pipe body 11,
The heat transfer medium corresponds to the hydraulic fluid 13,
The vaporization medium conduction path corresponds to the vaporization hydraulic fluid conduction space N,
The liquefied medium conduction path corresponds to wick 14,
The thermally conductive fluid corresponds to the pore water 21,
The guide tube corresponds to the sheath 20,
The filler corresponds to the filling mortar 103,
The low temperature promotion part corresponds to the heat radiation fin 15,
The present invention is not limited only to the configuration of the above-described embodiment, and many embodiments can be obtained.

  As the interstitial water 21, a member having thermal conductivity and fluidity such as a liquid other than water, a gel body, and a metal powder may be used. Further, the gap between the heat pipe 10 inserted into the sheath 20 and the sheath 20 may be used. Although the interstitial water 21 was poured in between, the curing may be performed without pouring the interstitial water 21 depending on the interval and the situation between the heat pipe 10 and the sheath 20.

  In the above description, the plurality of sheaths 20, that is, the voids B are arranged so as to have a lattice shape at substantially equal intervals in the plane direction. However, according to the shape and size of the structure to be arranged, single character arrangement, cross-character arrangement, and plan view correction It is good also as arrangement | positioning in which the space | interval of the voids B becomes substantially equal intervals, such as triangular arrangement | positioning, a lattice arrangement | positioning, or a zigzag arrangement | positioning.

Furthermore, as shown in FIG. 16, the voids B may be arranged such that the distance between the voids B is wider on the outside in plan view than on the center side in plan view. 16A shows a cross-sectional view taken along the line AA of the concrete structure 100 in which the void B (sheath 20) is arranged in the arrangement as described above, and FIG. 16B is a plan view of the structure. A cross-sectional view is shown.
Specifically, as shown in FIG. 16, the sheath 20 is arranged with respect to the heat pipe 100 so that the interval between the adjacent voids B gradually increases from the center in plan view toward the outside in plan view.

  As described above, the interval between the sheaths 20 forming the void B is dense at the center in plan view where the heat of hydration is high, and is sparse at the outside in plan view where the heat of hydration is low, that is, a heat pipe inserted into the void B 10 is densely arranged on the center side in plan view where the heat of hydration is high, and is sparsely arranged on the outside in plan view where the heat of hydration is low. It can conduct heat.

  Moreover, although the sheath 20 was arrange | positioned to the perpendicular direction and the void B of the perpendicular direction was formed, you may form the void B so that it may become diagonally upward toward the exterior from the inside of the concrete structure 100. FIG.

  Moreover, although the placement concrete 30 was cast in order to construct the concrete structure 100, depending on the structure of the concrete structure 100, general structural concrete, cold concrete, hot concrete, mass concrete, fluidized concrete, high Appropriate concrete such as fluid concrete may be cast, and grout such as non-shrink mortar or cement milk may be cast.

Furthermore, instead of the heat pipe 10, a member having high thermal conductivity such as a rod-shaped or plate-shaped copper member may be used as the heat conductive member.
Further, in order to promote the lowering of the temperature of the low temperature part 10a, the cooling may be promoted by cooling with a cooling pack in addition to blowing air toward the low temperature part 10a.

DESCRIPTION OF SYMBOLS 10 ... Heat pipe 10c ... High temperature part 10a ... Low temperature part 11 ... Pipe main body 13 ... Hydraulic fluid 14 ... Wick 15 ... Radiation fin 20 ... Sheath 21 ... Pore water 30 ... Concrete cast 103 ... Concrete structure 103 ... Filling mortar B ... Void N ... Vaporization fluid conduction space

Claims (4)

A cylindrical guide tube is installed before placing, and a void communicating between the inside and outside of the placed concrete is provided so as to face upward with respect to the inside of the placed concrete ,
A member main body in which one end side in the axial direction is set by the high temperature portion and the other end side is set in the low temperature portion, a heat transfer medium that is enclosed in the member main body and absorbs and evaporates, and is disposed in the member main body. And a vaporization medium conduction path for conducting the heat transfer medium vaporized by absorbing heat in the high temperature section to the low temperature section, and a conduction path to the low temperature section through the vaporization medium conduction path, and cooling in the low temperature section A liquefied medium conduction path that conducts the liquefied heat transfer medium to the high temperature portion, and a heat conduction member that conducts heat from the high temperature portion toward the low temperature portion , wherein the low temperature portion is the cast concrete. Placed on the void to be on the outside of the
A thermal conductive fluid having thermal conductivity is injected between the void formed larger in diameter than the thermal conductive member and the thermal conductive member disposed in the void, and the temperature is increased by heat of hydration. From the inside of the concrete to the outside, the heat conduction member conducts heat to cure the cast concrete,
After the setting concrete is hardened, the heat conducting member and the guide tube are removed,
By filling the void with a filler having a specific gravity greater than that of the thermally conductive fluid composed of a liquid, even if the thermally conductive fluid remains inside the void, the specific gravity is higher than that of the filler. A method for curing cast-in concrete, in which a thermally conductive fluid, which is a small liquid, floats without being mixed with the filler and closes the void . The method for curing cast concrete according to claim 1, wherein a plurality of the voids are arranged in a plane direction with respect to the cast concrete. The method for curing cast concrete according to claim 2 , wherein an interval between the voids arranged in a plane direction is set wider on the outside in the plane direction than the center side in the plane direction of the cast concrete. The method for curing cast concrete according to any one of claims 1 to 3 , wherein a low temperature promotion step for promoting low temperature is performed on the low temperature portion.

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